[Bug 259799] devel/rust-cbindgen: armv6: build using "make" fails, using "cargo build --release -j 1" works

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259799

--- Comment #42 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Mark Millard from comment #41)


Looks like:

rustc_errors::Handler::delay_good_path_bug

was initiated by ( quoting
https://doc.rust-lang.org/stable/nightly-rustc/rustc_middle/ty/print/pretty/fn.trimmed_def_paths.html
):

Function rustc_middle::ty::print::pretty::trimmed_def_pathsCopy item path
[−][src]

fn trimmed_def_paths(tcx: TyCtxt<'_>, (): ()) -> FxHashMap<DefId, Symbol>
The purpose of this function is to collect public symbols names that are unique
across all crates in the build. Later, when printing about types we can use
those names instead of the full exported path to them.

So essentially, if a symbol name can only be imported from one place for a
type, and as long as it was not glob-imported anywhere in the current crate, we
can trim its printed path and print only the name.

This has wide implications on error messages with types, for example,
shortening std::vec::Vec to just Vec, as long as there is no other Vec
importable anywhere.

The implementation uses similar import discovery logic to that of ‘use’
suggestions.

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